issues: 1781047747

e.g. in https://github.com/simonw/datasette/actions/runs/5413590227/jobs/9839373852

``` =================================== FAILURES =================================== _____ testhomepage _______ [gw0] linux -- Python 3.7.17 /opt/hostedtoolcache/Python/3.7.17/x64/bin/python

ds_client = <datasette.app.DatasetteClient object at 0x7f85d271ef50>

@pytest.mark.asyncio
async def test_homepage(ds_client):
    response = await ds_client.get("/.json")
    assert response.status_code == 200
    assert "application/json; charset=utf-8" == response.headers["content-type"]
    data = response.json()
    assert data.keys() == {"fixtures": 0}.keys()
    d = data["fixtures"]
    assert d["name"] == "fixtures"
    assert d["tables_count"] == 24
    assert len(d["tables_and_views_truncated"]) == 5
    assert d["tables_and_views_more"] is True
    # 4 hidden FTS tables + no_primary_key (hidden in metadata)
    assert d["hidden_tables_count"] == 6
    # 201 in no_primary_key, plus 6 in other hidden tables:

  assert d["hidden_table_rows_sum"] == 207, data

E AssertionError: {'fixtures': {'color': '9403e5', 'hash': None, 'hidden_table_rows_sum': 0, 'hidden_tables_count': 6, ...}} E assert 0 == 207 ``` My guess is that this is a timing error, where very occasionally the "count rows but stop counting if it exceeds a time limit" thing fails.